Aside from Pikachu and Jigglypuff (whose costume accessories change from game to game), Samus is the only character to have one of her team-based costumes change between games: In the original Smash Bros. and Melee, Samus wears her default (orange) costume when she is on the red team, but in Brawl, her pink costume is used instead. This could be due to the fact that in her Zero Suit, her default costume color is blue. So they needed to give her a new costume that would depict both forms in something closely resembling Red.